Strategies for Landing an Oracle DBA Job as a Fresher
Back To The Future.Key 2
1. Back to the Future
Lessons from the Past for Today’s Web Developers
Bill Scott
2008 Yahoo! Front End Developer’s Summit
10.08.2008
2. “There's an old saying about
those who forget history. I don't
remember it, but it's good.”
Stephen Colbert, The Colbert Report, March 10, 2008
3. Lessons from the Past
Importance of Tools
Proficiency in Debugging
Understanding the Leaky Abstraction
Being Pixel Retentive
Inspired by Problems
Students of Beautiful Code
12. browser performance visibility
no real visibility into
memory consumption
processing times
javascript engine
rendering engine
reflow times
page event timing (Episodes, Jiffy)
19. example: gzip breaks safari
page weight dropped by 6x
outbound network traffic dropped in half
20. rules of debugging
1. understand the system
2. make it fail
3. quit thinking and look
4. divide and conquer
5. change one thing at a time
6. keep an audit trail http://www.debuggingrules.com/
http://www.whyprogramsfail.com/toc.php
7. check the plug
8. get a fresh view
9. if you didn't fix It, it ain't fixed
22. understanding deep magic
story of GATO development
barely understood the language
barely understood mac development
afterward determined to understand the deep magic
disassembled ROM, commented all the code
wrote numerous utilities
asked what happens from click to render
23. building on abstractions
boosts productivity
but what happens when you have to look underneath?
the “leaky abstraction” syndrome
it’s easy to just fiddle till it works but not stop to ask why
24. example: closures
Most candidates we interview
cannot accurately explain a closure
cannot detect common errors with closures
If you use closures you should understand closures
When something goes wrong you have to understand it
var alertFuncs = [];
for(var i = 0; i < 3; i++) {
var alertFunc = function(value) {
return function() {
alert(value);
}
}(i);
alertFuncs.push(alertFunc);
}
for (var i = 0; i < alertFuncs.length; i++) {
alertFuncs[i]();
}
25. example: toolkits
libraries have been a big boost to our community
however, it’s easy to end up knowing a library but not really
what the library does for them
it’s ok to focus on the usage of a library, but a little dose of
curiosity a day will teach you a lot
26. example: end to end
http request to http response is basic
but do we understand what happens and when?
getting a picture of the overall picture helps us track down
performance issues
28. end-point paranoia (quickdraw)
coordinate system infinitely thin lines between pixels
(0,0) (8,0)
(0,4) (8,4)
filling or framing a rectangle: 0,0,8,4
points anchor to thin grid, to right & below
42. wang calculator
Find out if the given number was prime
Instructions: J if 0, J if +, J if <>0, J if Err,
Store, Recall, Mark, Search, Set PC, Indir
Sieve of Eratosthenes
62. Lessons from the Past
Importance of Tools
Proficiency in Debugging
Understanding the Leaky Abstraction
Being Pixel Retentive
Inspired by Problems
Students of Beautiful Code
